The US has long sat at the centre of the global financial system, with the US dollar serving as the backbone of the world economy. Private investors rely on the dollar as a store of value in times of uncertainty.

Governments and central banks hold dollars to manage the value of their own currencies and as a form of insurance against economic shocks. Key commodities such as oil are also priced in dollars.

This dominant position, which has given the US enormous privileges including the capacity to borrow money cheaply and the ability to use the global financial system as a tool of statecraft, is often explained through the size and stability of US markets and the strength of its institutions. But beneath these economic fundamentals lies something more intangible: trust.

Countries and private financial institutions hold dollars, trade in dollars and borrow in dollars because they trust the US to maintain an open, rules-based international order. They also trust the US to honour contracts, protect property rights and manage the world’s financial plumbing responsibly by acting as an international lender of last resort during periods of crisis.

The dollar system has long had its critics. In the aftermath of the global financial crisis, which occurred between 2007 and 2009, emerging economies faced severe spillovers from US monetary policy and growing exposure to dollar-denominated debt. They also witnessed the increasing use of financial sanctions as a tool........

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